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The "Lovely Cube" Headphone Amp (Lehmann Black Cube Linear Clone) - Page 70

post #1036 of 1416

I think the front panel doesn't look too good in the one photo because of the lighting.

post #1037 of 1416

it just looks a bit roughly ground on the edges....

Of course, if you are planning an SE version with an outer case 'like wot I done', then the inner case does not matter too much as long as it shields the amp....so you could get away with a specially designed front panel.....you have any DIY skills or know anyone who can cut/bend sheet metal, etc? The front panel could be made out of 6mm perspex, laser cut, or brass, chrome plated, etc....world's your oyster, really! Especially if you live in an area where there are little traditional machine shops in the backstreets....

post #1038 of 1416

Hello guys...

I  bought a Lovely Cube a few months ago.

After many OPAMPs changes...
I found a HUGE improvement using the AUDIO-GD OPA-Earth.
It need a extension cord for fitting it inside the case (Cap Type - about 150-200mm).

http://www.audio-gd.com/Pro/diy/OPA/OPAEN.htm

 

There was an noticeable improvement in the sound extension.
More defined bass and treble.
More natural and spatial sounds.

Just great !!!


I will take some pictures soon...

post #1039 of 1416

 

My first attempt at building a clone. Sounds good and hardly use my Graham Slee Novo now. Top picture is the bare board. Board £25. Chassis £40. Transformer £20. Alps pot £10. 


Edited by jimbomak - 5/25/13 at 1:44am
post #1040 of 1416

My Clone and Graham Slee Novo. Might have to tweak it a little bit. Already replaced clone volume control with an Alps and input capacitors with 2.2uF 400V MKP Polypropylene film capacitors . Also replaced op amp that came with it for an OPA2604AP. Myself and my friend prefer the clone to the Novo. Use Audio Technica ATH AD700 and Grado SR325 headphones on these.

post #1041 of 1416

Ictmanganer you have mail. I want to discuss parts choice.Thanks...

Algar_emi
 

post #1042 of 1416

I completely removed the power supply from my headphone amplifier. I built a Lt1083 regulated +-15v power supply  to power the amp. here are pictures. I haven't hooked it up as yet. The transformer is 80VA, dual 18V secondaries. Filter caps., 10,000uF, dual bridge discrete diodes. I will post updates when I get time to do some more work on the unit.

 

 

 

 

I've finally finished the power supply and amplifier.  The new power supply took the amplifier to a different lever of performance. I removed all the power supply parts from the original design. I don't really like the sound of LM3xx regulators, too harsh and noisy.

 

 


Don't expect miracles by just replacing passive components. The heart of every audio system is the power supply, so that's why I spent so much time building the best sounding power supply for the amp. The improvements especially in the bass areas are nothing short of subwoofer quality deep and controlled. Music comes out of a dark silent background with authority and fullness. The power supply is fully adjustable and is very stable and runs very cool.

 

Additional changes that I made to the amp are input caps are polypropylene in oil, power rail caps are Panasonic FM 680uF and 470uF bypassed with .1uf, silver mica caps input to ground on op amp. I will roll op amps to hear what suits me best. I also replaced the phone sockets with Neutrik gold plated. My objective is to  address areas that make the most significant difference in sound.

 

I'll probably sell this amp and move on to the next project. If you have questions, just email me.

 

Reply


Edited by staxPatrick - 5/17/14 at 5:08am
post #1043 of 1416

That is one serious first post.  Very nice work.

post #1044 of 1416

Hello to all..

This is my ever first post on a forum..
But it is now more than one year I red every post of this thread.

I managed to build a "personnal" clone of the Lehmann..
I used all excellent components.. PRP résistors, Siemens styroflex, Mundorf caps, Panasonics, .. LME49720HA opa..
I Think I reached a top of quality.. It sounds very, very good with my Sennheisers HD 600..

 

I tried to post a picture.. but system says there is a communication problem with the server..

I 'll try later..

post #1045 of 1416

can you convert the lovely cube to "dual mono"?

post #1046 of 1416
Quote:
Originally Posted by Carlitos View Post

can you convert the lovely cube to "dual mono"?

Convert? Not that I know of - You could do full balanced by building two of them in one casing. 

post #1047 of 1416

ok thankss!  so no "lovely matrix quattro cube" for me   confused_face.gif

post #1048 of 1416

Its Engineering after all

post #1049 of 1416

Hello..

Can you maybe tell me how to post pictures while replying?
I get no form when I click on the "insert image" icon..
Can it be because I've IE10?

 

Regards.

Daniel

post #1050 of 1416
Quote:
Originally Posted by Danielsc View Post

Hello..

Can you maybe tell me how to post pictures while replying?
I get no form when I click on the "insert image" icon..
Can it be because I've IE10?

 

Regards.

Daniel

It is because of your post count , once you go over 30-40 you will be able to post pics :P

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